Absolute properties of the oscillating eclipsing Algol XZ Ursae Majoris

IF 2.2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Publications of the Astronomical Society of Japan Pub Date : 2024-01-25 DOI:10.1093/pasj/psad085
Jae Woo Lee, Kyeongsoo Hong, Hye-Young Kim, Marek Wolf, Jang-Ho Park, Pakakaew Rittipruk
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Abstract

It is known from archival TESS data that the semi-detached Algol system XZ Ursae Majoris (UMa) is one of the candidate binary stars exhibiting short-period oscillations. We secured new high-resolution spectroscopic observations for the program target to better understand its binary and pulsation properties. From the echelle spectra, the radial velocities (RVs) of the eclipsing pair were derived, and the atmosphere parameters of the primary component were measured to be vAsin i = 80 ± 7 km s−1, Teff, A = 7940 ± 120 K, and [M/H] = −0.15 ± 0.20. The combined solution of our double-lined RVs and the TESS data provides robust physical parameters for XZ UMa with mass and radius measurement precision of better than 2%. The outside-eclipse residuals from a mean light curve in the 0.002 phase bin were used for multifrequency analyses, and we extracted 32 significant frequencies (22 in <5.0 d−1 and 10 in 39–52 d−1). The low frequencies may be mostly aliasing sidelobes, while six of the high frequencies may be pulsation signals arising from the detached primary located inside the δ Sct domain. Their periods, pulsation constants, and pulsational–orbital-period ratios indicate that the mass-accreting primary star is a δ Sct pulsator and, hence, XZ UMa is an oscillating eclipsing Algol.
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大熊座摆动食星XZ的绝对特性
从 TESS 的档案数据中可以得知,半分离的太阳系 XZ 大熊座(UMa)是表现出短周期振荡的候选双星之一。我们对该计划目标进行了新的高分辨率光谱观测,以更好地了解其双星和脉动特性。从梯度光谱中得出了这对食双星的径向速度(RVs),并测量了主成分的大气参数:vAsin i = 80 ± 7 km s-1,Teff, A = 7940 ± 120 K,[M/H] = -0.15 ± 0.20。我们的双线 RV 和 TESS 数据的综合解法为 XZ UMa 提供了可靠的物理参数,质量和半径测量精度优于 2%。我们利用 0.002 相位区平均光曲线的日食外残差进行了多频分析,提取了 32 个重要频率(<5.0 d-1 中的 22 个频率和 39-52 d-1 中的 10 个频率)。低频可能主要是混叠边带,而 6 个高频可能是位于 δ Sct 域内的脱离主星产生的脉动信号。它们的周期、脉动常数和脉动轨道周期比都表明,产生质量的主星是一个 δ Sct 脉动器,因此 XZ UMa 是一颗振荡食星。
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来源期刊
Publications of the Astronomical Society of Japan
Publications of the Astronomical Society of Japan 地学天文-天文与天体物理
CiteScore
4.10
自引率
13.00%
发文量
98
审稿时长
4-8 weeks
期刊介绍: Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.
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